Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c2b0e22f2b6166…

MALICIOUS

PDF

76.0 KB Created: 2021-03-06 05:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f9823dc379e538d3e8ffa5d32de5fa5 SHA-1: 9cd3174dbab6360f82217dec48801a76817e6771 SHA-256: b5c2b0e22f2b6166e2d4ffe62c948ac542b44387353118e89811408807502598
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=what+do+the+silk+stockings+symbolize+death+of+a+salesman PDF link annotation
    • https://cdn.sqhk.co/tememagitapo/jgN24gf/100._3_the_wolf.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/dozefaraxapatexule.pdfIn PDF document text
    • http://vanojipiredatu.iblogger.org/jekaditaxak.pdfIn PDF document text
    • http://lidagejelotodu.22web.org/fimakifanak.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/egcALic/monster_spawner_farm_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/cfgiiWG/49784693690.pdfIn PDF document text
    • http://punejew.mygamesonline.org/how_many_paragraphs_is_a_two_page_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/kixituvelil/eL4jahe/king_of_the_sea_in_spanish.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/68783537548.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/EAFjdjc/71911001546.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/excelsior_college_cost_of_attendance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/mozafenalufekizozew.pdfIn PDF document text
    • http://zigixaf.rf.gd/agendas_2019_para_imprimir_gratis.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_44df64298b6841ad8e33f1713f255ac7.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_22335c08bb8e4a77896d4b3079a0ba72.pdf?index=trueIn PDF document text
    • http://sorajapiliwixod.rf.gd/paxopal.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/hungry_shark_apk_hile_5._9._4.pdfIn PDF document text
    • http://modedavap.epizy.com/33822926747.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_a17b83ee27304b67b8f3c94a5ec3d6f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/pathfinder_book_of_infinite_spells.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_433841d99228496db155cc5b7d0c08ed.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_6c730aed3b17405d81bdc0a0ef55dfe2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 5708 bytes
SHA-256: 44c2053ff15341305363881f5986a3b5d1b7fec6cc244356af6a1984a05dcb8b
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10412 bytes
SHA-256: bcd771600e4b8e452119f355286edede6f2c2e89cf2353d77fdb2e0b1951177e